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Budwick Ahh.
I recently read somewhere that it's a liberal trait to see the world in shades of grey and a conservative trait to see things in black and white, and while I think that's at least an overgeneralization, I do see shades of grey.
We give the franchise to citizens only over 18, but not felons, for example. Slaves werent citizens, and they couldn't vote, despite counting as 3/5 of a person for population, and women couldn't vote. We tweaked the franchise to change that, and I think it's fair to continue to consider tweeaking it again, as time goes on, although I tend to like the old enough to serve, old enough to vote thing, and happen to think, if men have to register for the selective service, women should too, and we can do both voting and registration at 18.
The slope I was talking about was restricting voting rights on the basis of some criteria, like advanced age, which might tend to correlate with capacity, or, as OP suggested, as worthiness on the basis of the value of their vote.
I don't like this and don't trust it. I never have. As a child, I had an older man talk to me quite a bit about his view that what was wrong with the country was letting people who didn't own land vote. I disagreed with that and still do, but I got his point that property owners are stakeholders, while renters are less so. Obviously, his issue was taxes, btw, and he had some issues with women and blacks as well, but that's really beside the point.
I generally think we ought to restrict voting to "citizens" and not residents, whether they're lawful or lawful residents.
But,I see the wisdom of denying the franchise to felons, and, even though I like the 18 minimum age, can see why an argument could be made for making it 21 again, or even 30.
I don't have as much of a problem with a clear choice of who can vote, though, as I do with less clear or sneaky ways to limit voting. Poll taxes and literacy tests, for example are IMO pernicious not just because they have been used to discourage minority voters, but because they are easily subject to abuse.
On the other hand, I really don't have much, if any problem with motor voting registration, or even a voter ID law, IF it's phased in, and steps are taken to ensure that its applied fairly, i.e., that dmv offices in some counties aren't scarce, or that there's a way to apply by mail, etc.
Obviously, homeless people with no power box or transportation might still be proportionately inconvenienced or constructively disenfranchised, and we should take whatever steps we can agree on as fair and reasonable to help with that, but it points out what I was saying before:. Its never just black and white, but always shades of grey, and we need to, at some point, decide to call something on one side of the line or the other and , not just live with the call forever, but look at it again after awhile and see if it's working well.
Sorry for the long rant.